1948 flathead transmission question

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May 12, 2009 | 10:19 PM

bakkaman

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1948 flathead transmission question

Hi,
I have a 1948 ford f4 truck with a stock t-9 Borg Warner transmission (4 speed non synchronized) and a 226 flat head 6 cylinder engine. Transmission has a pto that operates a hydraulic dump bed. I am interested in upgrading the existing transmission to 4 speed, synchronized tranny with pto. Any suggestions and sources would be appreciated.
Thanks,
Mark

May 13, 2009 | 07:40 AM

bobj49f2

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From: SE Wisc. (the Rust Belt)

The easiest swap might be a '51 and up transmission. I think after '51 a synchronized transmission was standard, before it was an option. The synchronized transmission is slightly longer so you have to make sure you get the correct drive shaft:

Non-synchro tranny:

Synchronized tranny:

You can the difference by the shift pattern. As you know the non-synchro tranny has reverse to the right and down, the synchronized tranny has reverse to the right and up.

I've also read about people who have used the T-5 transmission in the larger trucks without a problem, I'm not sure if it's strong enough to do any heavy hauling.